1. C. R. Noller“Chemistry of Organic compounds”, W. B. Saunders Co. , Philadelphia , 1966 , p, 198 .
2. C. Rebick in“Advances in Chemistries Series. 183”, American Chemical Society , 1979 , p. 1 .
3. R. Schlosberg manuscript submitted for publication .
4. R. T. Morrison and R. N. Boyd“Organic Chemistry”,, 2nd Edition , Allyn and Bacon, Inc. , Boston , 1967 , p. 688 .